Composite shapes in real life

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Learn it Split the shape into rectangles, triangles and trapezoids (add) or start with a big shape and remove the gaps (subtract). Round UP when buying materials.

Example: A 20 m × 12 m lawn has a 2 m path all around it. Find the path's area.

Outer: $(20 + 4) \times (12 + 4) = 384$ m².
Lawn: $20 \times 12 = 240$ m².
Path: $384 - 240 = 144$ m².

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